Download or read book Transient Air Dynamics Modeling for an Advanced Alternative Fueled Engine written by Ryan Everett and published by . This book was released on 2010 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The EcoCAR challenge is a three year competition with a goal of re-engineering a 2009 General Motors crossover utility vehicle to improve vehicle emissions and fuel economy, while maintaining drivability and consumer acceptability. Ohio State's team has selected a plug-in hybrid electric vehicle (PHEV) architecture with a 1.8 L CNG Honda engine as the auxiliary power unit. The Honda engine is converted to run on E85 fuel, which requires the engine control software to be rewritten. The purpose of this research is to write a feed forward air/fuel ratio (AFR) control algorithm to better manage fuel injection during transient engine events. AFR control has a major impact on engine fuel economy and tail pipe emissions. This research investigates the accuracy of using a dynamic intake manifold filling and emptying model coupled with a linear approximation of the Taylor Series expansion to predict air flow forward in time. To better estimate air flowing passed the throttle plate and into the intake manifold, a quasi-static effective area map of the throttle was created. The control algorithm uses the throttle effective area map to improve the accuracy of air flow estimation into the intake manifold because the MAF sensor is not a reliable flow meter during transient engine events. It also uses a feed forward volumetric efficiency map to predict mass air flow exiting the intake manifold. It was found that by using feed forward control software and empirical engine maps to predict manifold air pressure forward in time, a better estimate of mass air flow entering the cylinder was achieved. The creation of this software allows the EcoCAR vehicle to better maintain a stoichiometric AFR during transients, which reduces tail pipe emissions species, including NOx, CO, and unburned Hydrocarbons.
Download or read book Introduction to Modeling and Control of Internal Combustion Engine Systems written by Lino Guzzella and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal combustion engines still have a potential for substantial improvements, particularly with regard to fuel efficiency and environmental compatibility. These goals can be achieved with help of control systems. Modeling and Control of Internal Combustion Engines (ICE) addresses these issues by offering an introduction to cost-effective model-based control system design for ICE. The primary emphasis is put on the ICE and its auxiliary devices. Mathematical models for these processes are developed in the text and selected feedforward and feedback control problems are discussed. The appendix contains a summary of the most important controller analysis and design methods, and a case study that analyzes a simplified idle-speed control problem. The book is written for students interested in the design of classical and novel ICE control systems.
Download or read book Alternative Fuels and Advanced Vehicle Technologies for Improved Environmental Performance written by Richard Folkson and published by Elsevier. This book was released on 2014-03-19 with total page 803 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most vehicles run on fossil fuels, and this presents a major emissions problem as demand for fuel continues to increase. Alternative Fuels and Advanced Vehicle Technologies gives an overview of key developments in advanced fuels and vehicle technologies to improve the energy efficiency and environmental impact of the automotive sector. Part I considers the role of alternative fuels such as electricity, alcohol, and hydrogen fuel cells, as well as advanced additives and oils, in environmentally sustainable transport. Part II explores methods of revising engine and vehicle design to improve environmental performance and fuel economy. It contains chapters on improvements in design, aerodynamics, combustion, and transmission. Finally, Part III outlines developments in electric and hybrid vehicle technologies, and provides an overview of the benefits and limitations of these vehicles in terms of their environmental impact, safety, cost, and design practicalities. Alternative Fuels and Advanced Vehicle Technologies is a standard reference for professionals, engineers, and researchers in the automotive sector, as well as vehicle manufacturers, fuel system developers, and academics with an interest in this field. - Provides a broad-ranging review of recent research into advanced fuels and vehicle technologies that will be instrumental in improving the energy efficiency and environmental impact of the automotive sector - Reviews the development of alternative fuels, more efficient engines, and powertrain technologies, as well as hybrid and electric vehicle technologies
Download or read book Transient Air to Fuel Ratio Response in a Fuel Injected S I Engine written by Göran Almkvist and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of an improved dynamic engine vehicle model application to examination of air fuel ratio control during rapid transients written by Shekhar K. Dongre and published by . This book was released on 1991 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feed forward Air fuel Ratio Control During Transient Operation of an Alternative Fueled Engine written by Andrew Michael Garcia and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: With the increasing government regulations for higher vehicle fuel economy and lower tailpipe emissions, today's automotive engineers are pushed to develop advanced vehicles. Further, due to the high prices of oil, the consumer market is demanding for more fuel efficient vehicles. To adapt to the increasing demands, automotive manufacturers have been investing in the research of advanced vehicle technologies. The work described in this thesis details the development of a methodology to improve the feed-forward air-fuel ratio control during transient operation of an alternative fueled engine.
Download or read book Diesel Engine Transient Operation written by Constantine D. Rakopoulos and published by Springer Science & Business Media. This book was released on 2009-03-10 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally, the study of internal combustion engines operation has focused on the steady-state performance. However, the daily driving schedule of automotive and truck engines is inherently related to unsteady conditions. In fact, only a very small portion of a vehicle’s operating pattern is true steady-state, e. g. , when cruising on a motorway. Moreover, the most critical conditions encountered by industrial or marine engines are met during transients too. Unfortunately, the transient operation of turbocharged diesel engines has been associated with slow acceleration rate, hence poor driveability, and overshoot in particulate, gaseous and noise emissions. Despite the relatively large number of published papers, this very important subject has been treated in the past scarcely and only segmentally as regards reference books. Merely two chapters, one in the book Turbocharging the Internal Combustion Engine by N. Watson and M. S. Janota (McMillan Press, 1982) and another one written by D. E. Winterbone in the book The Thermodynamics and Gas Dynamics of Internal Combustion Engines, Vol. II edited by J. H. Horlock and D. E. Winterbone (Clarendon Press, 1986) are dedicated to transient operation. Both books, now out of print, were published a long time ago. Then, it seems reasonable to try to expand on these pioneering works, taking into account the recent technological advances and particularly the global concern about environmental pollution, which has intensified the research on transient (diesel) engine operation, typically through the Transient Cycles certification of new vehicles.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vehicle Level Transient Aircraft Thermal Management Modeling and Simulation written by Adam B. Donovan and published by . This book was released on 2016 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many advances in technology are expected to increase the capabilities of next generation aircraft, and these advances will increase the thermal load on the aircraft as well. In order to assess and account for these increased thermal loads, three studies were performed: a fuel pump trade study, a high energy pulsed system (HEPS) implementation study, and a legacy vehicle environmental control system (ECS) study. The fuel pump study addresses the effect of the implementation of a centrifugal fuel pump versus a variable displacement fuel pump. Traditionally, aircraft designers have used a centrifugal fuel pump over a piston based pump based primarily on mass, volume, cost, and reliability. This study considers specific excess power (SEP), fuel burn and thermal margin and shows the piston based pump performing superior mainly because it eliminates fuel recirculation resulting in an increased thermal margin. This investigation demonstrates the benefit of capturing component level models and thermal concerns in the conceptual design process. Both of these issues are vital to the development of future aircraft designs. Additional research needs to be completed to compare both pumps based on the mass and volume of each system. The second study investigates the implementation of a HEPS device at an air vehicle level. HEPS generate excessive amounts of heat during operation, creating challenges in how to integrate them into an aircraft without overwhelming the vehicle’s power and thermal management systems (TMS). In order to evaluate the impact of the HEPS electrical and thermal load on the aircraft's mission, a vehicle level modeling and simulation (M&S) effort must be executed of the power and thermal management systems. To accurately evaluate the total effect on the aircraft, the HEPS must be integrated into a Tip to Tail (T2T) model of the system that includes the aircraft power and thermal management subsystems. With the HEPS system integrated into the T2T model, not only can its mass and volume effects be analyzed, but also the transient power and thermal loads created by the new system can be evaluated for their effect on other aircraft subsystems. Furthermore, the aircraft subsystems can be optimized to vehicle level metrics instead of subsystem level only. This will result in a more effective and balanced overall aircraft design. Using a T2T model to evaluate the integration of a HEPS system on an aircraft will enable assessment of its overall impact to next generation aircraft. Therefore, the significant impact of highly dynamic power and thermal loads on next generation aircraft is addressed. The third study is the implementation of an air cycle based ECS in a legacy (4th generation) air vehicle. Relatively few attempts have been made to define appropriate validation testing constructs for T2T analysis in a transient mode of operation. Current research addresses the process of validation testing using legacy aircraft systems in order to acquire relevant data that will lead to the validation of existing models, and different modeling methods. The model developed in this work will eventually be utilized in these validation efforts at a later date. To this end, an air vehicle system (AVS), turbine engine, generator, and environmental control system (ECS) have been modeled in a T2T model of the actual legacy system. In particular, this study will focus on the creation and integration of the ECS model. The ECS uses an air cycle machine, which utilizes a Brayton refrigeration cycle to cool the air to the cockpit and avionics. The ECS model will be shown to successfully cool these components while subjected to varying bleed rates from the turbine engine.
Download or read book Vehicle Propulsion Systems written by Lino Guzzella and published by Springer Science & Business Media. This book was released on 2007-09-21 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors of this text have written a comprehensive introduction to the modeling and optimization problems encountered when designing new propulsion systems for passenger cars. It is intended for persons interested in the analysis and optimization of vehicle propulsion systems. Its focus is on the control-oriented mathematical description of the physical processes and on the model-based optimization of the system structure and of the supervisory control algorithms.
Download or read book Modeling of Real Fuels and Knock Occurrence for an Effective 3D CFD Virtual Engine Development written by Francesco Cupo and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To drastically reduce the emission of greenhouse gases, the development of future internal combustion engines will be strictly linked to the development of CO2 neutral fuels (e.g. biofuels and e-fuels). This evolution implies an increase in development complexity, which needs the support of engine 3D-CFD simulations. Francesco Cupo presents approaches to accurately describe fuel characteristics and knock occurrence in SI engines, thus improving the current simulation capability in investigating alternative fuels and innovative combustion processes. The developed models are successfully used to investigate the influence of ethanol-based fuels and water injection strategies on knock occurrence and to conduct a virtual fuel design for and engine operating with the innovative SACI combustion strategy. Contents Detailed description of real fuels Locally-distributed auto-ignition model and knock detection Influence of ethanol-based fuels and water injection on combustion and knock Virtual fuel design for SACI combustion strategy Target Groups Researchers and students in the field of automotive engineering Automotive engineers The Author Francesco Cupo obtained a PhD at the research Institute of Automotive Engineering (IFS) in Stuttgart, Germany. His activity is currently focusing on the design of advanced internal combustion engines and alternative fuels.
Download or read book Advanced Automotive Technologies Annual Report to Congress Fiscal Year 1996 written by and published by . This book was released on 1998 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Biofuels written by Kalam Abul Azad and published by Woodhead Publishing. This book was released on 2019-06-09 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Biofuels: Applications, Technologies, and Environmental Sustainability presents recent developments and applications of biofuels in the field of internal combustion engines, with a primary focus on the recent approaches of biodiesel applications, low emission alternative fuels, and environmental sustainability. Editors Dr. Azad and Dr. Rasul, along with their team of expert contributors, combine a collection of extensive experimental investigations on engine performance and emissions and combustion phenomena using different types of oxygenated fuel with in-depth research on fuel applications, an analysis of available technologies and resources, energy efficiency improvement methods, and applications of oxygenated fuel for the sustainable environment. Academics, researchers, engineers and technologists will develop a greater understanding of the relevant concepts and solutions to the global issues related to achieving alternative energy application for future energy security, as well as environmental sustainability in medium and large-scale industries. - Fills a gap in the literature on alternative fuel applications with in-depth research and experimental investigations of different approaches, technologies and applications - Considers the important issue of sustainability using case studies to deepen understanding - Includes energy security within various industries, including aviation and transport
Download or read book Proceedings of the 1995 American Control Conference written by American Automatic Control Council and published by . This book was released on 1995 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Simulation and Control Design for Diesel Engine NOx Emission Reduction Technologies written by Hai Wu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fuel efficiency and emission reductions are the two consistent drivers for internal combustion engine development for both on-highway and off-road vehicles. Advanced combustion technologies are proposed for the improvement of fuel consumption and reduction of harmful gas production inside the cylinder in laboratory engines. Outside cylinder technologies and after-treatment are the alternatives for a production engine to meet the stringent emission standards. Advanced control technologies play important roles in the realization of new technologies. This research was aimed at investigating possible techniques and feasible methods of implementation to reduce diesel engine emissions to meet the more stringent Tier 4 standards. In this study, two technologies are studied for off-road diesel engine NOx emission reductions: stoichiometric combustion ignition (SCI) and lean NOx trap (LNT). The concept of the stoichiometric compression ignition (SCI) engine was investigated for implementation in a turbocharged diesel engine through co-simulation. At first, an integrated environment for 1D engine modeling with control function was proposed for a SCI performance evaluation and control implementation. The SCI engine has been evaluated by Constant Speed Load Acceptance tests under steady-state and transient conditions. For SCI implementations, basic controls have been designed including air-fuel ratio (AFR) control, torque limiting control and idle speed control. The proposed control strategies have been verified with 1D detail models in the integrated environments. Further, the Mean Value Engine Model (MVEM) is proposed for advanced model based control design. The SCI engine subsystems are modeled using an orifice constrain model for throttle, turbine, and wastegate; filling and emptying model for intake and exhaust manifolds; rotational dynamic for engine camshaft and turbocharger shift, air-charging model and exhaust properties regressed by the data from integrated simulation at different engine operating conditions. The MVEM was implemented in Matlab/Simulink for verification. Modular and system verification was conducted for steady-state and transient state consistency with the 1D detail model. The results are promising, but the whole system needs further tuning for dynamic control design. The lean-NOx trap, as an alternative after-treatment for NOx control, has been studied for generic diesel engine emission control. Based on experimental data, an improved NOx adsorption model is proposed for integrated engine control and optimization.
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 2000 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
